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calculator_MkIII.html
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calculator_MkIII.html
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<!DOCTYPE html>
<html lang="en"></html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.0.0.js"></script>
<link rel="stylesheet" href="css/bootstrap.css">
<script src="js/bootstrap.js"></script>
</head>
<body>
<main class="container">
<div class="col-sm-6 col-sm-offset-3">
<div class="panel panel-default col-sm-12">
<form class="panel-body col-sm-12">
<div class="col-sm-12">
<div class="">
<input type="text" class="form-control" id="display">
</div>
<div>
<input type="button" class="btn btn-default col-sm-3" value="7" onclick="toDisplay(this)" id="seven">
<input type="button" class="btn btn-default col-sm-3" value="8" onclick="toDisplay(this)" id="eight">
<input type="button" class="btn btn-default col-sm-3" value="9" onclick="toDisplay(this)" id="nine">
<input type="button" class="btn btn-default col-sm-3" value="^" onclick="toDisplay(this)" id="exp">
</div>
<div>
<input type="button" class="btn btn-default col-sm-3" value="4" onclick="toDisplay(this)" id="four">
<input type="button" class="btn btn-default col-sm-3" value="5" onclick="toDisplay(this)" id="five">
<input type="button" class="btn btn-default col-sm-3" value="6" onclick="toDisplay(this)" id="six">
<input type="button" class="btn btn-default col-sm-3" value="/" onclick="toDisplay(this)" id="div">
</div>
<div>
<input type="button" class="btn btn-default col-sm-3" value="1" onclick="toDisplay(this)" id="one">
<input type="button" class="btn btn-default col-sm-3" value="2" onclick="toDisplay(this)" id="two">
<input type="button" class="btn btn-default col-sm-3" value="3" onclick="toDisplay(this)" id="three">
<input type="button" class="btn btn-default col-sm-3" value="*" onclick="toDisplay(this)" id="mult">
</div>
<div>
<input type="button" class="btn btn-default col-sm-3" value='.' onclick="toDisplay(this)" id="decimal">
<input type="button" class="btn btn-default col-sm-3" value="0" onclick="toDisplay(this)" id="zero">
<input type="button" class="btn btn-default col-sm-3" value="+" onclick="toDisplay(this)" id="add">
<input type="button" class="btn btn-default col-sm-3" value="-" onclick="toDisplay(this)" id="sub">
</div>
<div>
<input type="button" class="btn btn-default col-sm-12" value='Clear' onclick="toDisplay(this)" id="clear">
<input type="button" class="btn btn-default col-sm-12" value="GO" onclick="toDisplay(this)" id="equal">
<p id="demo"></p>
</div>
</div>
</form>
</div>
</div>
</main>
<script>
/*
function whichButton(event) {
document.getElementById("demo").innerHTML = event.keyCode;
if (event.keyCode == 187) {
display.value = evaluateInput(display.value);
}
}
*/
function evaluateInput(toEvaluate) {
var finalProduct = 0;
for (var i = 0; i < toEvaluate.length; i++) {
if (i == -1) {
break;
}
if (isOperator(toEvaluate[i])) {
if (toEvaluate[i] == '^') {
finalProduct = 0;
var exponentValue = (Number(toEvaluate[(i + 1)]));
var root = (Number(toEvaluate[(i - 1)]));
finalProduct = root;
for (var x = 1; x < exponentValue; x++) {
finalProduct = finalProduct * root;
}
toEvaluate.splice((i - 1), 3, finalProduct.toString());
i--;
}
continue;
} else {
continue;
}
}
for (var i = 0; i < toEvaluate.length; i++) {
if (i == -1) {
break;
}
if (isOperator(toEvaluate[i])) {
if (toEvaluate[i] == '/') {
finalProduct = 0;
finalProduct = ((Number(toEvaluate[(i - 1)])) / (Number(toEvaluate[(i + 1)])));
toEvaluate.splice((i - 1), 3, finalProduct.toString());
i--;
} else if (toEvaluate[i] == '*') {
finalProduct = 0;
finalProduct = ((Number(toEvaluate[(i - 1)])) * (Number(toEvaluate[(i + 1)])));
toEvaluate.splice((i - 1), 3, finalProduct.toString());
i--;
}
continue;
} else {
continue;
}
}
for (var i = 0; i < toEvaluate.length; i++) {
if (i == -1) {
break;
}
if (isOperator(toEvaluate[i])) {
if (toEvaluate[i] == '+') {
finalProduct = 0;
finalProduct = ((Number(toEvaluate[(i - 1)])) + (Number(toEvaluate[(i + 1)])));
toEvaluate.splice((i - 1), 3, finalProduct.toString());
i--;
} else if (toEvaluate[i] == '-') {
finalProduct = 0;
finalProduct = ((Number(toEvaluate[(i - 1)])) - (Number(toEvaluate[(i + 1)])));
toEvaluate.splice((i - 1), 3, finalProduct.toString());
i--;
}
continue
} else {
continue
}
}
return finalProduct;
}
// determines if the input character is an operator i.e :operators = ['+', '-', '*', '/']
function isOperator(inputChar) {
inputChar = inputChar.toString();
var operators = ['+', '-', '*', '/', '^'];
for (var i = 0; i < operators.length; i++) {
var isFound = false;
var opFound = inputChar.indexOf(operators[i]);
if (opFound == -1) {
continue;
} else {
isFound = true;
return isFound;
}
}
}
// space out the operators
function spaceOutOperator(inputString) {
var outputString = '';
for (var i = 0; i < inputString.length; i++) {
if (isOperator(inputString.charAt(i))) {
outputString += ' ' + inputString.charAt(i) + ' ';
continue;
} else {
outputString += inputString.charAt(i);
}
}
return outputString;
}
// convert string from display to array based off the spaces placed on either side of the operators
function toArray(string) {
string = spaceOutOperator(string);
var isArray = string.split(' ');
for (var i = 0; i < isArray.length; i++) {
if (isArray[i] == ' ' || isArray[i] == '') {
console.log(isArray);
isArray.splice(i, 1);
i--;
}
}
return isArray;
}
//print to screen
var display = document.getElementById('display');
display.value = '';
function toDisplay(element) {
var userInput = element.value;
if (userInput == "Clear") {
display.value = "";
} else if (userInput == "GO") {
var inputArray = toArray(display.value);
console.log(inputArray);
display.value = evaluateInput(inputArray);
} else {
display.value += userInput;
}
}
</script>
</body>
</html>